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less: interpret backspace.

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less is officially declared PAGER-capable! ;)
(this includes viewing of manpages)
This commit is contained in:
Denis Vlasenko 2006-12-31 19:23:31 +00:00
parent c519320000
commit 95b307103a
1 changed files with 13 additions and 0 deletions
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13
miscutils/less.c
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@ -212,11 +212,21 @@ static void read_lines(void)
} }
} }
c = readbuf[readpos]; c = readbuf[readpos];
/* backspace? [need this for manpage display] */
if (c == '\x8' && linepos) {
readpos++; /* eat it */
/* We do not consider the case of <tab><bs> */
/* Anyone who has that is pure evil :) */
linepos--;
*p-- = '\0';
continue;
}
if (c == '\t') if (c == '\t')
linepos += (linepos^7) & 7; linepos += (linepos^7) & 7;
linepos++; linepos++;
if (linepos >= w) if (linepos >= w)
break; break;
/* ok, we will eat this char */
readpos++; readpos++;
if (c == '\n') { terminated = 1; break; } if (c == '\n') { terminated = 1; break; }
/* NUL is substituted by '\n'! */ /* NUL is substituted by '\n'! */
@ -1175,6 +1185,9 @@ int less_main(int argc, char **argv)
{ {
int keypress; int keypress;
/* TODO: -x: do not interpret backspace, -xx: tab also */
/* -xxx: newline also */
/* -w N: assume width N (-xxx -w 32: hex viewer of sorts) */
getopt32(argc, argv, "EMmN~"); getopt32(argc, argv, "EMmN~");
argc -= optind; argc -= optind;
argv += optind; argv += optind;